78760421 has 2 divisors, whose sum is σ = 78760422. Its totient is φ = 78760420.

The previous prime is 78760399. The next prime is 78760471. The reversal of 78760421 is 12406787.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78676900 + 83521 = 8870^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 78760421 - 2¹⁰ = 78759397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78760471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39380210 + 39380211.

It is an arithmetic number, because the mean of its divisors is an integer number (39380211).

Almost surely, 2^78760421 is an apocalyptic number.

It is an amenable number.

78760421 is a deficient number, since it is larger than the sum of its proper divisors (1).

78760421 is an equidigital number, since it uses as much as digits as its factorization.

78760421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 78760421 is about 8874.7068120586. The cubic root of 78760421 is about 428.6498502154.

The spelling of 78760421 in words is "seventy-eight million, seven hundred sixty thousand, four hundred twenty-one".